Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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FCLEX Instruction
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  Title:    Clear Exceptions
 
  Syntax:   FCLEX
            FNCLEX
 
  See also: Status Word
 
  Description:
 
     Clears all exception flags, the busy flag, and bit 7 in the status
     word. Bit 7 is the interrupt-request flag on the 8087 and the
     error-status flag on the 80287, 80387, and 80486.
 
     This instruction has wait and no-wait versions. The wait version
     (FCLEX) checks for unmasked numeric errors. The no-wait version
     (FNCLEX) does not. When the .8087 directive is used, the assembler
     puts the WAIT instruction before the wait versions and the NOP
     instruction before the no-wait versions.
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